Clarify NWB dataset source in README

[vijayiyer05]

@ttngu207 @eywalker We took this live script for a spin recently. Based on the README, it sounds like it should work out of the box with the CRNS datasets. But that didn't work. We're pretty sure (*) what happened is this was run with the NWB generated by the tandem Python repository for this dataset. Can you confirm?

If so, a README update is the recommended issue resolution.

(*) haven't had a chance to test yet

[ttngu207]

Hi @vijayiyer05 , you are correct, the script is intended to work on the NWB dataset, generated from the original CRNS datasets. The NWB conversion step can be done with the accompanying python routine.
The NWB conversion step is specified in the README:

• Data download
• NWB conversion